Dust extractor

Abstract

A dust extractor ( 1 ) includes: a head ( 2 ) having a top cover ( 13 ); a tank ( 3 ) disposed below the head and on which a first electrically conductive member ( 41 ) is mounted; a tank cover ( 4 ) disposed between the head and the tank and having a cover part ( 16 ) covering an opening ( 3 F) in an upper-end portion of the tank and a suction tube ( 17 ) into which a dust-extracting hose ( 6 ) is insertable, and on which a second electrically conductive member ( 42 ) is mounted; and a suction unit ( 7 ) that includes a motor ( 24 ) and a blower fan ( 25 ) that is rotated by a rotational force generated by the motor, and that generates a suction force in the suction tube. The first electrically conductive member is grounded. The second electrically conductive member is electrically connected to the first electrically conductive member.

The invention claimed is: 
     
         1 . A dust extractor comprising:
 a head having a top cover;   a tank disposed below the head in an up-down direction of the dust extractor;   a first electrically conductive member mounted on the tank;   a tank cover disposed between the head and the tank, the tank cover including a cover part that covers an opening in an upper-end portion of the tank and a suction tube into which a dust-extracting hose is insertable;   a second electrically conductive member mounted on the tank cover; and   a suction unit that includes a blower fan, which is rotated by a rotational force generated by a motor and thereby generates a suction force in the suction tube;   wherein:   the first electrically conductive member is grounded; and   the second electrically conductive member is electrically connected to the first electrically conductive member.   
     
     
         2 . The dust extractor according to  claim 1 , wherein at least a portion of the second electrically conductive member is disposed in the interior of the suction tube and is configured to contact the dust-extracting hose. 
     
     
         3 . The dust extractor according to  claim 1 , wherein the second electrically conductive member is an elastic member. 
     
     
         4 . The dust extractor according to  claim 3 , wherein the second electrically conductive member includes a leaf spring. 
     
     
         5 . The dust extractor according to  claim 1 , wherein the first electrically conductive member includes a lead line. 
     
     
         6 . The dust extractor according to  claim 5 , further comprising:
 a connector mounted on an end portion of the lead line; and   a screw connected to the connector and fixing the connector to the tank;   wherein the second electrically conductive member electrically contacts the screw.   
     
     
         7 . The dust extractor according to  claim 1 , further comprising:
 a screw connected to the first electrically conductive member and fixing the first electrically conductive member to the tank;   wherein the second electrically conductive member electrically contacts the screw.   
     
     
         8 . The dust extractor according to  claim 7 , wherein:
 a screw boss is provided on an inner surface of the tank; and   the screw fixes the first electrically conductive member to the screw boss.   
     
     
         9 . The dust extractor according to  claim 1 , wherein:
 an upper-end portion of the second electrically conductive member is disposed to face a passageway of the suction tube;   a lower-end portion of the second electrically conductive member is disposed below a lower surface of the cover part in the up-down direction; and   an intermediate portion of the second electrically conductive member between the upper-end portion and the lower-end portion is fixed to at least a portion of the tank cover.   
     
     
         10 . The dust extractor according to  claim 9 , wherein the intermediate portion is embedded in a wall of the tank cover. 
     
     
         11 . The dust extractor according to  claim 10 , wherein:
 a hole is provided in the intermediate portion; and   at least a portion of the tank cover penetrates into the hole.   
     
     
         12 . The dust extractor according to  claim 9 , wherein:
 a ring portion is provided on an inner surface of the suction tube; and   an upper-end portion of the second electrically conductive member is disposed in a notched portion provided in a portion of the ring portion.   
     
     
         13 . The dust extractor according to  claim 1 , wherein the first electrically conductive member is supported by an inner surface of the tank. 
     
     
         14 . The dust extractor according to  claim 13 , further comprising an intermediate holding member that is provided on the inner surface of the tank and holds the first electrically conductive member. 
     
     
         15 . The dust extractor according to  claim 14 , wherein:
 the intermediate holding member includes a first protruding part, which protrudes from the inner surface of the tank, and a second protruding part adjacent to the first protruding part; and   the first electrically conductive member is inserted between the first protruding part and the second protruding part.   
     
     
         16 . The dust extractor according to  claim 1 , further comprising:
 a lower-end holding member that is inserted into an opening provided in a bottom portion of the tank;   wherein:   at least a portion of the first electrically conductive member is held by the lower-end holding member; and   a lower-end portion of the first electrically conductive member is disposed below a lower surface of the tank in the up-down direction.   
     
     
         17 . The dust extractor according to  claim 2 , wherein:
 the second electrically conductive member is an elastic member;   the first electrically conductive member includes a lead line supported by an inner surface of the tank;   an upper-end portion of the second electrically conductive member is disposed to face a passageway of the suction tube;   a lower-end portion of the second electrically conductive member is disposed below a lower surface of the cover part in the up-down direction; and   an intermediate portion of the second electrically conductive member between the upper-end portion and the lower-end portion is fixed to at least a portion of the tank cover.   
     
     
         18 . The dust extractor according to  claim 17 , further comprising:
 a lower-end holding member that is inserted into an opening provided in a bottom portion of the tank;   wherein:   at least a portion of the first electrically conductive member is held by the lower-end holding member; and   a lower-end portion of the first electrically conductive member is disposed below a lower surface of the tank in the up-down direction.   
     
     
         19 . The dust extractor according to  claim 18 , wherein the second electrically conductive member includes a leaf spring. 
     
     
         20 . The dust extractor according to  claim 19 , wherein:
 the intermediate portion is at least partially embedded in a wall of the tank cover;   a hole is provided in the intermediate portion; and   at least a portion of the tank cover penetrates into the hole.